CN115149217A - Flexible electrode, display device and wearable equipment - Google Patents

Flexible electrode, display device and wearable equipment Download PDF

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Publication number
CN115149217A
CN115149217A CN202110340581.3A CN202110340581A CN115149217A CN 115149217 A CN115149217 A CN 115149217A CN 202110340581 A CN202110340581 A CN 202110340581A CN 115149217 A CN115149217 A CN 115149217A
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flexible
energy storage
layer
storage unit
flexible battery
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CN115149217B (en
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魏悦涵
崔越
朱红
王博
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Priority to CN202110340581.3A priority Critical patent/CN115149217B/en
Priority to PCT/CN2021/125849 priority patent/WO2022205861A1/en
Priority to US18/274,489 priority patent/US20240136626A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/238—Flexibility or foldability
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/163—Wearable computers, e.g. on a belt
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1635—Details related to the integration of battery packs and other power supplies such as fuel cells or integrated AC adapter
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/0445—PV modules or arrays of single PV cells including thin film solar cells, e.g. single thin film a-Si, CIS or CdTe solar cells
    • H01L31/046—PV modules composed of a plurality of thin film solar cells deposited on the same substrate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/121—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/136—Flexibility or foldability
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0277—Bendability or stretchability details
    • H05K1/0283—Stretchable printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/14—Structural association of two or more printed circuits
    • H05K1/141—One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Biophysics (AREA)
  • Sustainable Development (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Energy (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The disclosure discloses a flexible electrode, a display device and wearable equipment, which are used for avoiding the defects of bubbles, folds, cracks and the like in the area between adjacent energy storage units in the bending process of a flexible battery. The flexible battery that this disclosed embodiment provided, flexible battery includes: a support layer; the flexible conducting layer is positioned on one side of the supporting layer; the energy storage units are arranged at intervals in a first direction on one side of the flexible conducting layer, which is far away from the supporting layer, and are electrically connected with the flexible conducting layer; a first package structure comprising: a convex portion covering the energy storage cells, and a concave portion located between adjacent energy storage cells; the first package structure has a modulus of elasticity in a range of 30 mpa to 100 mpa.

Description

Flexible electrode, display device and wearable equipment
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a flexible electrode, a display device, and a wearable device.
Background
How to solve the problem of electric power shortage of wearable equipment becomes the research focus in the current flexible field. In recent years, lithium ion batteries have been widely used in the fields of portable products, backup power supplies, electric vehicles, and the like, because of their advantages such as high energy density and long cycle life. In the prior art, one of the flexible batteries is a bamboo joint battery, the bamboo joint battery divides the battery into a plurality of sections, and different sections are connected through a single layer of flexible planar electrode to form a multi-section flexible battery. The rigid area is a battery energy storage part and does not participate in bending; the flexible region is a flexible electrode and can be bent. The flexible function of the whole battery is realized through local bending and local rigidity at multiple positions. However, the bamboo joint battery has defects such as bubbles, wrinkles, cracks and the like at the joints of the rigid units around the rigid units in the use process. If the defects are continuously used, the defects can be continuously deepened, and the leakage of the battery is caused, so that the battery is failed.
Disclosure of Invention
The embodiment of the disclosure provides a flexible electrode, a display device and wearable equipment, which are used for avoiding the defects of bubbles, folds, cracks and the like in the area between adjacent energy storage units in the bending process of a flexible battery.
The flexible battery that this disclosed embodiment provided, flexible battery includes:
a support layer;
the flexible conducting layer is positioned on one side of the supporting layer;
the energy storage units are arranged at intervals in a first direction on one side of the flexible conducting layer, which is far away from the supporting layer, and are electrically connected with the flexible conducting layer;
a first package structure comprising: a convex portion covering the energy storage cells, and a concave portion located between adjacent energy storage cells; the first package structure has a modulus of elasticity in a range of 30 mpa to 100 mpa.
In some embodiments, the first encapsulation structure has a modulus of elasticity in a range of 40 megapascals to 50 megapascals.
In some embodiments, the thickness of the first package structure in a direction perpendicular to the support layer is in a range of 150 micrometers to 200 micrometers.
In some embodiments, the first package structure comprises:
a first barrier layer;
the first metal layer is positioned on one side, away from the energy storage unit, of the first barrier layer;
the first bonding layer is positioned on one side of the first metal layer, which is far away from the first barrier layer;
the second barrier layer is positioned on one side of the first bonding layer, which is far away from the first metal layer;
and the third barrier layer is positioned on one side of the second barrier layer, which is deviated from the first bonding layer.
In some embodiments, the material of the first barrier layer comprises: polypropylene; the material of the first metal layer comprises aluminum; the material of the second barrier layer comprises nylon; the material of the third barrier layer includes a resin.
In some embodiments, a flexible battery includes: further comprising:
the second packaging structure is positioned on one side of the supporting layer, which is far away from the first packaging structure, and the elastic modulus of the second packaging structure is within a range of 30 MPa to 100 MPa;
the flexible conducting layer is further located on one side, close to the second packaging structure, of the supporting layer, and the energy storage units are further located on one side, close to the second packaging structure, of the flexible conducting layer.
In some embodiments, the distance between any two adjacent energy storage units is equal in the first direction.
In some embodiments, the battery capacity C of each energy storage unit unit The following conditions are satisfied:
C unit ＝Δ×t×e×(W-f)；
and delta is the volume energy density of the energy storage unit, t is the thickness of the first conductive layer, e is the width of the energy storage unit in the first direction, W is the width of the supporting layer in the direction perpendicular to the first direction, and f is the distance between the edge of the supporting layer extending along the first direction and the energy storage unit.
In some embodiments, the width e of the energy storage unit in the first direction satisfies the following condition:
Figure RE-GDA0003179945110000031
wherein, C unit For each cell capacity of the energy storage unit, Δ isThe volume energy density of the energy storage unit, t is the thickness of the first conductive layer, W is the width of the supporting layer in the direction perpendicular to the first direction, f is the distance between the edge of the supporting layer extending along the first direction and the energy storage unit, and a is the thickness of the first packaging structure in the direction perpendicular to the flexible conductive layer.
In some embodiments, the battery capacity Cunit of each energy storage unit satisfies the following condition:
Figure RE-GDA0003179945110000032
wherein, C total And N is the number of the energy storage units.
In some embodiments, the minimum bending radius r of the flexible conductive layer, the distance d between two adjacent energy storage units, and the width e of the energy storage unit in the first direction satisfy the following condition:
Figure RE-GDA0003179945110000033
d is the distance between two adjacent energy storage units, s is the distance between the neutral plane of the flexible conductive layer in a bent state and an unbent state, alpha is the included angle between two adjacent energy storage units on two sides of the bent position in the bent state of the flexible conductive layer, and rho is the local bending radius of the flexible conductive layer.
An embodiment of the present disclosure provides a display device, including: the flexible battery that this disclosed embodiment provided is located display substrate one side to the display substrate.
In some embodiments, the display device further comprises:
and the shell is positioned on one side, deviating from the display substrate, of the flexible battery and is positioned on one side, deviating from the supporting layer, of the first packaging structure.
In some embodiments, the enclosure has: a plurality of first recesses receiving the raised portions of the first package structure.
In some embodiments, the display device includes, on a side of the display substrate, a plurality of flexible batteries; the flexible batteries are located on the same plane and are electrically connected through the flexible circuit board.
In some embodiments, the housing further has a second recess; the orthographic projection of the second groove on the display substrate covers the area between two adjacent flexible batteries;
the display device further includes:
the mainboard is electrically connected with the flexible circuit board and is positioned in the second groove.
In some embodiments, two side surfaces of the second groove parallel to the first direction respectively have: a first opening and a second opening;
the first opening exposes the starting button of the mainboard;
the second opening exposes the charging end of the mainboard.
The wearable device provided by the embodiment of the disclosure comprises the flexible battery provided by the embodiment of the disclosure and arranged on one side of the display substrate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without inventive efforts.
Fig. 1 is a schematic structural diagram of a flexible battery provided in an embodiment of the present disclosure;
FIG. 2 is a cross-sectional view along AA' of FIG. 1 provided by an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a first package structure according to an embodiment of the disclosure;
fig. 4 is a schematic diagram of a maximum strain position of a flexible battery according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an energy storage unit in a flexible battery according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a flexible conductive layer in a flexible battery according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of another flexible battery provided in the embodiments of the present disclosure;
fig. 8 is a schematic geometric relationship diagram of a flexible battery provided in an embodiment of the present disclosure in an unbent state;
fig. 9 is a schematic view of a flexible battery provided in an embodiment of the present disclosure in a bent state;
FIG. 10 is an enlarged schematic view of area C of FIG. 9 provided by an embodiment of the present disclosure;
fig. 11 is a graph illustrating a relationship between a discharge voltage and a battery capacity of a flexible battery provided by an embodiment of the present disclosure;
fig. 12 is a graph illustrating cycle life test results for a flexible battery provided by an embodiment of the present disclosure;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the disclosure;
fig. 14 is a cross-sectional view along DD' in fig. 13 provided by an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. And the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without inventive step, are within the scope of protection of the disclosure.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
It should be noted that the sizes and shapes of the various figures in the drawings are not to scale, but are merely intended to illustrate the present disclosure. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
It should be noted that, in the related art, when the flexible battery is bent, in the region between the battery energy storage units, the film layer encapsulating the battery energy storage units is prone to generate cross striations in the extending direction of the battery energy storage units, and the maximum bending strain is relatively large, usually 10% to 14.48%, and the maximum strain is concentrated in the regions corresponding to the two ends of the battery energy storage units in the extending direction, and the film layer encapsulating the battery energy storage units in the regions is prone to generate defects such as bubbles and cracks, which results in encapsulation failure, leakage of the battery energy storage units, and affects the service life of the flexible battery.
Based on the above problems in the related art, embodiments of the present disclosure provide a flexible battery, as shown in fig. 1 and 2, including:
a support layer 1;
the flexible conducting layer 2 is positioned on one side of the supporting layer 1;
the energy storage units 3 are arranged at intervals along the first direction X on one side, away from the supporting layer 1, of the flexible conducting layer 2 and are electrically connected with the flexible conducting layer 2;
a first package structure 4 comprising: a convex portion 5 covering the energy storage cells 3, and a concave portion 6 located between adjacent energy storage cells 3; the modulus of elasticity of the first encapsulation structure 4 is in the range of 30 mpa to 100 mpa.
It should be noted that fig. 2 may be a cross-sectional view along AA' in fig. 1, for example, and the first encapsulation layer is not shown in fig. 1 for the sake of clarity to illustrate the projection relationship of the energy unit, the flexible conductive layer and the support layer.
It should be noted that, in the related art, the elastic modulus of the first package structure is usually 20 mpa to 30 mpa.
In the flexible battery provided by the embodiment of the disclosure, the elastic modulus of the first packaging structure for packaging the energy storage unit is in a range of 30 mpa to 100 mpa, and compared with the related art, the elastic modulus of the first packaging layer is improved, so that the maximum bending strain can be reduced, the position of the maximum bending strain can be changed, the maximum bending strain is prevented from concentrating at two ends of the energy storage unit in the extension direction, the defects of bubbles, cracks and the like in the bending process of the first packaging layer can be avoided, the bending cross striations of the first packaging structure in the region between the adjacent energy storage units can be avoided, and the energy storage unit liquid leakage caused by packaging failure is avoided, so that the yield of the flexible battery can be improved, and the service life of the flexible battery is prolonged.
In some embodiments, the first encapsulation structure has a modulus of elasticity in a range of 40 megapascals to 50 megapascals.
The flexible battery provided by the embodiment of the disclosure, compare in the correlation technique and improved the elastic modulus of first encapsulation layer, thereby can reduce the biggest strain of buckling, can also change the position that the biggest strain of buckling, avoid buckling the biggest strain and concentrating at the both ends of energy storage unit extending direction, can avoid first encapsulation layer bubble appear in the in-process of buckling, defects such as crackle, can also avoid first packaging structure cross striation of buckling to appear in the region between adjacent energy storage unit, avoid the encapsulation inefficacy to lead to the energy storage unit weeping, thereby can improve the yield of flexible battery, improve the life of flexible battery.
In some embodiments, as shown in fig. 3, the first package structure includes:
a first barrier layer 7;
the first metal layer 8 is positioned on one side, away from the energy storage unit, of the first barrier layer 7;
a first adhesive layer 20 on the side of the first metal layer 8 facing away from the first barrier layer 7;
a second barrier layer 9 on a side of the first adhesive layer 20 facing away from the first metal layer 8;
a third barrier layer 10 on the side of the second barrier layer 9 facing away from the first adhesive layer 20.
Fig. 3 may be, for example, a second package structure corresponding to the area B in fig. 2.
In specific implementation, the elastic modulus of the first encapsulation layer can be improved by selecting materials of the film layers of the first encapsulation layer, so that the elastic modulus of the first encapsulation structure is within a range from 40 mpa to 50 mpa.
In some embodiments, the material of the first barrier layer comprises: polypropylene; the material of the first metal layer comprises aluminum; the material of the second barrier layer comprises nylon; the material of the third barrier layer includes a resin. The first adhesive layer includes, for example, an adhesive. Namely, the first package structure may be an aluminum plastic film. Namely, the aluminum plastic film is a composite material consisting of a metal aluminum layer and a multilayer barrier layer.
In a specific implementation, the first barrier layer and the first metal layer may also be bonded by an adhesive, that is, the first encapsulation layer further includes a second adhesive layer between the first barrier layer and the first metal layer.
In some embodiments, a thickness of the first package structure in a direction perpendicular to the support layer is in a range from 150 micrometers to 200 micrometers.
It should be noted that, in the related art, the thickness of the first package structure ranges from 50 micrometers to 100 micrometers.
The flexible battery that this disclosed embodiment provided, compare in the thickness of correlation technique bodiness first encapsulation layer, thereby can further reduce the biggest strain of buckling, can also change the position that the biggest strain of buckling, avoid buckling the biggest strain and concentrating on the both ends of energy storage unit extending direction, can avoid first encapsulation layer bubble appearing in the in-process of buckling, defects such as crackle, can also avoid the region of first packaging structure between adjacent energy storage unit to appear the cross striation of buckling, avoid the encapsulation inefficacy to lead to the energy storage unit weeping, thereby can improve flexible battery's yield, improve flexible battery's life.
In some embodiments, the thickness of the first barrier layer may range, for example, from 50 microns to 70 microns; the thickness of the first metal layer may be, for example, in the range of 65 to 90 microns; the thickness of the first bonding layer can be, for example, in the range of 3 to 5 micrometers; the thickness of the second barrier layer may be, for example, in the range of 25 to 35 microns; the thickness of the third barrier layer may be, for example, in the range of 5 to 7 microns.
It should be noted that, in implementation, the first package structure may simultaneously satisfy a value of the elastic modulus in a range of 40 mpa to 50 mpa, and a value of the thickness in a direction perpendicular to the support layer in a range of 150 micrometers to 200 micrometers. Thereby further reducing the maximum bending strain and also changing the position of the maximum bending strain.
The first package structure simultaneously satisfies the conditions that the elastic modulus is within a range of 40 to 50 megapascals, and the thickness in the direction perpendicular to the support layer is within a range of 150 to 200 micrometers, the flexible battery provided by the embodiment of the disclosure is simulated, the maximum strain range is 5 to 9.96 percent, as shown in fig. 4, the region 22 is a region corresponding to the energy storage unit, and the maximum strain region 21 is no longer located in regions corresponding to two ends of the energy storage unit in the extension direction. Therefore, the defects of bubbles, cracks and the like in the bending process of the first packaging layer can be avoided, and the leakage of the energy storage unit caused by packaging failure is avoided, so that the yield of the flexible battery can be improved, and the service life of the flexible battery is prolonged.
In some embodiments, the thickness of the protruding portion of the first package structure in the direction perpendicular to the support layer is equal to the thickness of the recessed portion in the direction perpendicular to the support layer.
In some embodiments, as shown in fig. 5, the energy storage unit includes: positive electrode tab 11, winding core 12, insulating paste 13 and negative electrode tab 14.
In specific implementation, the energy storage unit can be used as a lithium battery, and the winding core of the energy storage unit can be formed by winding a positive plate, a diaphragm and a negative plate. The plurality of energy storage units may be connected by a flexible connection member, which may be made of the same material as the diaphragm, or may be a flexible circuit board or the like.
In some embodiments, as shown in fig. 6, the flexible conductive layer comprises: a third adhesive layer 15, a fourth adhesive layer 16, and a conductive layer 17 between the third adhesive layer 15 and the fourth adhesive layer 16.
In specific implementation, the third adhesive layer and the fourth adhesive layer include a rubber material, the rubber material may be, for example, a polymer compound, and the conductive layer and the energy storage unit are insulated in a region outside the electrical connection in the flexible battery, and meanwhile, the function of improving the mechanical property of the conductive layer and coating the conductive layer can be achieved. In a specific implementation, an adhesive material may be applied or deposited on the conductive layer to form an adhesive layer, or a metal may be sputtered on the adhesive material to form the conductive layer.
In specific implementation, as shown in fig. 6, the conductive layer 17 is connected with a plurality of sub tabs 18 by welding, where the plurality of sub tabs 18 include a plurality of positive sub tabs 23 and a plurality of negative sub tabs (not shown), a group of positive sub tabs 23 and negative sub tabs are respectively located at two ends of the energy storage unit in the extension direction, each positive sub tab 23 is electrically connected with a positive tab of one energy storage unit, each negative sub tab is electrically connected with a negative tab of one energy storage unit, the plurality of positive sub tabs 23 are electrically connected with each other, and the plurality of negative sub tabs are electrically connected with each other, so that the plurality of energy storage units are connected in parallel. The conductive layer further comprises a first tab 24 and a second tab (not shown), the first tab 24 is electrically connected to the plurality of positive sub-tabs 23, the second tab is electrically connected to the plurality of negative sub-tabs, and the first tab and the second tab are respectively used as a positive tab and a negative tab of the flexible battery.
In some embodiments, the support layer comprises an aluminum plastic film or a steel plastic film.
In a specific implementation, the structure of the aluminum-plastic film used as the supporting layer may be the same as that of the aluminum-plastic film used as the first package structure, that is, a composite material composed of a metal aluminum layer and a multilayer barrier layer may be used as the supporting layer.
In particular, the steel-plastic mold may be a composite material composed of a stainless steel layer and a plurality of barrier layers. Specifically, the steel-plastic mold can be formed by compounding polypropylene, stainless steel, nylon and resin, and the polypropylene, the stainless steel, the nylon and the resin can be bonded through a bonding agent.
In specific implementation, the support layer not only supports the film layers on either side of the support layer, but also serves as a lower packaging structure and a first packaging structure to package the energy storage unit and the flexible conductive layer.
In some embodiments, as shown in fig. 7, a flexible battery includes: further comprising:
the second packaging structure 19 is positioned on one side, away from the first packaging structure 4, of the supporting layer 1, and the elastic modulus of the second packaging structure 10 is in a range of 30 MPa to 100 MPa;
the flexible conductive layer 2 is also positioned on one side of the support layer 1 close to the second packaging structure 19, and the plurality of energy storage units 3 are also positioned on one side of the flexible conductive layer 2 close to the second packaging structure 19.
The flexible battery provided by the embodiment of the disclosure comprises the double-layer energy storage unit, and the capacity of the flexible battery can be improved.
In some embodiments, the orthographic projections of the two groups of energy storage units respectively positioned at the two sides of the supporting layer are overlapped.
In some embodiments, the second package structure includes the same specific film layers as the first package structure. Namely, the second package structure includes: the first barrier layer, the first metal layer, the first bonding layer, the second barrier layer, and the third barrier layer.
In some embodiments, the first package structure and the second package structure comprise the same material, for example, both the first package structure and the second package structure may be aluminum-plastic films.
In some embodiments, the first encapsulation structure has a modulus of elasticity in a range of 40 megapascals to 50 megapascals.
In some embodiments, a thickness of the first package structure in a direction perpendicular to the support layer is in a range from 150 micrometers to 200 micrometers.
In some embodiments, the first package structure and the second package structure have the same elastic modulus and thickness.
In some embodiments, as shown in fig. 1, 2, and 7, in the first direction, the distance between any two adjacent energy storage units is equal.
In some embodiments, the battery capacity C of each energy storage unit unit The following conditions are satisfied:
C unit = Δ × t × e × (W-f) formula 1;
wherein Δ is the volumetric energy density of the energy storage unit, t is the thickness of the first conductive layer, e is the width of the energy storage unit in the first direction, W is the width of the support layer in a direction perpendicular to the first direction, and f is the distance between the edge of the support layer extending in the first direction and the energy storage cells.
When the battery capacity of the energy storage unit is determined, the thickness of the conductive layer, the width of the energy storage unit in the first direction, the width of the supporting layer in the direction perpendicular to the first direction and the distance between the edge of the supporting layer and the energy storage unit satisfy the formula 1, the bending performance of the flexible battery can be improved, and the service life of the flexible battery can be prolonged.
In some embodiments, the width e of the energy storage unit in the first direction satisfies the following condition:
Figure RE-GDA0003179945110000111
wherein, C unit And delta is the battery capacity of each energy storage unit, delta is the volume energy density of the energy storage unit, t is the thickness of the first conductive layer, W is the width of the supporting layer in the direction vertical to the first direction, f is the distance between the edge of the supporting layer extending along the first direction and the energy storage unit, and a is the thickness of the first packaging structure in the direction vertical to the flexible conductive layer.
When the width of the energy storage unit in the first direction is determined, the battery capacity of the energy storage unit, the thickness of the conductive layer, the width of the supporting layer in the direction perpendicular to the first direction and the distance between the edge of the supporting layer and the energy storage unit meet the formula 2, the bending performance of the flexible battery can be improved, and the service life of the flexible battery can be prolonged.
In some embodiments, the battery capacity C of each energy storage unit unit The following conditions are satisfied:
Figure RE-GDA0003179945110000112
wherein, C total And N is the total capacity of the flexible battery, and is the number of the energy storage units.
In particular implementation, the battery capacity of each energy storage unit may be determined according to the total battery capacity and the total number of energy storage units.
In some embodiments, the minimum bending radius r of the flexible conductive layer, the distance d between two adjacent energy storage units, and the width e of the energy storage unit in the first direction satisfy the following condition:
Figure RE-GDA0003179945110000113
the geometric relationships of the horizontal state and the bending state of the flexible battery are respectively shown in fig. 8, fig. 9 and fig. 10, wherein fig. 10 is an enlarged schematic view of a region C in fig. 9; d is the distance between two adjacent energy storage units, s is the distance between the neutral plane of the flexible conductive layer in a bent state and an unbent state, alpha is the included angle between two adjacent energy storage units on two sides of the bent position in the bent state of the flexible conductive layer, and rho is the local bending radius of the flexible conductive layer.
It should be noted that the neutral plane of the flexible conductive layer can be understood as the plane on which the flexible conductive layer is located. The local bending radius of the flexible conductive layer is related to the specific stacking structure of the flexible battery and can be determined through a local bending test.
According to the flexible battery provided by the embodiment of the disclosure, the minimum bending radius r of the flexible conducting layer, the distance d between two adjacent energy storage units and the width e of the energy storage unit in the first direction satisfy the formula 4, so that the bending performance of the flexible battery can be further improved, the flexible battery can resist multiple times of high-frequency bending, and the service life of the flexible battery is prolonged.
It should be noted that the above equations 1, 2, 3 and 4 are applicable to both the flexible battery including the single-layer energy storage unit and the flexible battery including the double-layer energy storage unit.
In fig. 2 and 7, the cross section of the energy storage unit is illustrated as a rectangle, and in a specific implementation, the cross section of the energy storage unit generally has a rounded rectangular shape. Next, taking the cross section of the energy storage unit as a rounded rectangle as a model, the flexible battery provided by the embodiment of the disclosure is simulated, where the minimum bending radius r of the flexible conductive layer is 15 mm ± 5 mm, the width e of the energy storage unit in the first direction is 9 mm ± 3 mm, when the distance d between two adjacent energy storage units is 8 mm ± 2 mm, the battery capacity is about 900 ma hr ± 100 ma hr, and the simulation result is shown in fig. 11 and 12. Fig. 11 shows the relationship between the discharge voltage and the discharge capacity of the flexible battery, and the rated capacity of the flexible battery model is about 1750 ma-hr. Fig. 12 shows the cycle life test results, i.e., the relationship between the number of times of cycle discharge and the discharge capacity, and the discharge capacity decay was within 10% at 100 cycles.
An embodiment of the present disclosure provides a display device, as shown in fig. 13, including: a display substrate 26, and a flexible battery 27 provided by the embodiment of the present disclosure on one side of the display substrate 26.
In some embodiments, as shown in fig. 13, the display device further includes:
a chassis 28 on a side of the flexible battery 27 facing away from the display substrate 26 and on a side of the first encapsulation structure facing away from the support layer.
In some embodiments, as shown in fig. 14, the housing has: a plurality of first recesses 29 receiving the raised portions of the first package structure.
Thus, the shape of the shell can be matched with that of the flexible battery, and the shell and the flexible battery are convenient to assemble.
It should be noted that, the display module, the flexible battery and the chassis in fig. 13 are not assembled, so as to clearly show the position relationship of the display module, the flexible battery and the chassis. Fig. 14 may be, for example, a cross-sectional view along DD' in fig. 13.
In specific implementation, when the flexible battery is assembled with the chassis, the convex part of the flexible battery is arranged in the first groove of the chassis.
In specific implementation, in the first direction, the width of the first groove is greater than that of the convex part of the flexible battery, and the width between two adjacent first grooves is less than that of two adjacent convex parts of the flexible battery. Such that the housing can accommodate the flexible battery when the flexible battery is assembled with the housing.
In some embodiments, as shown in fig. 13, the display device includes a plurality of flexible batteries on one side of the display substrate; the plurality of flexible batteries are located on the same plane, and the plurality of flexible batteries are electrically connected through the flexible circuit board 30.
It should be noted that fig. 13 illustrates an example in which the display device includes two flexible batteries. At one side of the display module, the two flexible batteries are arranged along a first direction and are electrically connected through the flexible circuit board.
In some embodiments, as shown in fig. 14, the chassis also has a second recess 31; the orthographic projection of the second groove 31 on the display substrate covers the area between two adjacent flexible batteries;
the display device further includes:
a main board (not shown), electrically connected to the flexible circuit board, is located in the second recess 31.
In some embodiments, as shown in fig. 13, two side surfaces of the second groove parallel to the first direction respectively have: a first opening 32 and a second opening (not shown);
the first opening 32 exposes the start-up key of the mainboard;
the second opening exposes the charging end of the mainboard.
In specific implementation, the display substrate may be, for example, a flexible display substrate, and since the display device includes the flexible battery provided in the embodiment of the present disclosure, a roll display, a fold display, or the like may be implemented.
The display device provided by the embodiment of the disclosure is: mobile phone, etc. any product or component with display function. Other essential components of the display device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present disclosure. The implementation of the display device can be referred to the above embodiments of the flexible battery, and repeated descriptions are omitted.
The wearable device provided by the embodiment of the disclosure comprises the flexible battery provided by the embodiment of the disclosure and arranged on one side of the display substrate.
The wearable device provided by the embodiment of the disclosure can be devices such as a smart band and a smart watch.
To sum up, according to the flexible battery, the display device and the wearable device provided by the embodiment of the disclosure, the elastic modulus of the first packaging structure for packaging the energy storage unit is taken as a value in a range from 30 megapascals to 100 megapascals, so that the maximum bending strain can be reduced, the position of the maximum bending strain can be changed, the maximum bending strain is prevented from concentrating at two ends in the extension direction of the energy storage unit, the defects of bubbles, cracks and the like in the bending process of the first packaging layer can be avoided, the bending cross striations in the region of the first packaging structure between adjacent energy storage units can be avoided, the leakage of the energy storage unit caused by the failure of packaging is avoided, the yield of the flexible battery can be improved, and the service life of the flexible battery is prolonged.
It will be apparent to those skilled in the art that various changes and modifications may be made to the present disclosure without departing from the spirit and scope of the disclosure. Thus, if such modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such modifications and variations as well.

Claims (18)

1. A flexible battery, wherein the flexible battery comprises:
a support layer;
a flexible conductive layer on one side of the support layer;
the energy storage units are arranged at intervals in a first direction on one side, away from the supporting layer, of the flexible conducting layer and are electrically connected with the flexible conducting layer;
a first package structure comprising: a convex portion covering the energy storage cells, and a concave portion between adjacent energy storage cells; the first package structure has a modulus of elasticity in a range of 30 mpa to 100 mpa.
2. The flexible battery of claim 1, wherein the first encapsulation structure has a modulus of elasticity in a range of 40 megapascals to 50 megapascals.
3. The flexible battery of claim 1, wherein a thickness of the first encapsulation structure in a direction perpendicular to the support layer is in a range of 150 microns to 200 microns.
4. The flexible battery of claim 1, wherein the first encapsulation structure comprises:
a first barrier layer;
the first metal layer is positioned on one side, away from the energy storage unit, of the first barrier layer;
the first bonding layer is positioned on one side, away from the first barrier layer, of the first metal layer;
the second barrier layer is positioned on one side, away from the first metal layer, of the first bonding layer;
and the third barrier layer is positioned on one side of the second barrier layer, which deviates from the first bonding layer.
5. The flexible battery of claim 4, wherein the material of the first barrier layer comprises: polypropylene; the material of the first metal layer comprises aluminum; the material of the second barrier layer comprises nylon; the material of the third barrier layer includes a resin.
6. The flexible battery of claim 1, wherein the flexible battery comprises: further comprising:
the second packaging structure is positioned on one side, away from the first packaging structure, of the supporting layer, and the elastic modulus of the second packaging structure is within a range of 30 megapascals to 100 megapascals;
the flexible conducting layer is further located on one side, close to the second packaging structure, of the supporting layer, and the energy storage units are further located on one side, close to the second packaging structure, of the flexible conducting layer.
7. The flexible battery according to any one of claims 1 to 6, wherein a distance between any adjacent two of the energy storage units is equal in the first direction.
8. The flexible battery of claim 7, wherein each of the energy storage units has a battery capacity C unit The following conditions are satisfied:
C unit ＝Δ×t×e×(W-f)；
and Δ is the volume energy density of the energy storage unit, t is the thickness of the first conductive layer, e is the width of the energy storage unit in the first direction, W is the width of the supporting layer in the direction perpendicular to the first direction, and f is the distance between the edge of the supporting layer extending along the first direction and the energy storage unit.
9. The flexible battery according to claim 7, wherein a width e of the energy storage unit in the first direction satisfies the following condition:
Figure FDA0002999413750000021
wherein, C unit And for the battery capacity of each energy storage unit, delta is the volume energy density of the energy storage unit, t is the thickness of the first conductive layer, W is the width of the supporting layer in the direction perpendicular to the first direction, f is the distance between the edge of the supporting layer extending along the first direction and the energy storage unit, and a is the thickness of the first packaging structure in the direction perpendicular to the flexible conductive layer.
10. The flexible battery according to claim 7, wherein the battery capacity Cunit of each energy storage unit satisfies the following condition:
Figure FDA0002999413750000022
wherein, C total And N is the number of the energy storage units.
11. The flexible battery according to claim 7, wherein a minimum bending radius r of the flexible conductive layer, a distance d between two adjacent energy storage units, and a width e of the energy storage units in the first direction satisfy the following condition:
Figure FDA0002999413750000023
and s is the distance between the neutral plane of the flexible conducting layer in a bent state and an unbent state, alpha is an included angle between two adjacent energy storage units on two sides of the bent position in the bent state of the flexible conducting layer, and rho is the local bending radius of the flexible conducting layer.
12. A display device, comprising: a display substrate, and a flexible battery according to any one of claims 1 to 11 on one side of the display substrate.
13. The display device according to claim 12, wherein the display device further comprises:
and the shell is positioned on one side of the flexible battery, which deviates from the display substrate, and is positioned on one side of the first packaging structure, which deviates from the supporting layer.
14. The display device of claim 13, wherein the chassis has a plurality of first recesses that receive the raised portions of the first encapsulation structure.
15. The display device according to any one of claims 13 to 14, wherein the display device includes a plurality of the flexible batteries on a side of the display substrate; the flexible batteries are located on the same plane and are electrically connected through the flexible circuit board.
16. The display device of claim 15, wherein the chassis further has a second recess covering an area between two adjacent flexible batteries in an orthographic projection of the display substrate;
the display device further includes:
and the main board is electrically connected with the flexible circuit board and is positioned in the second groove.
17. The display device according to claim 16, wherein two side surfaces of the second groove parallel to the first direction respectively have: a first opening and a second opening;
the first opening exposes a starting button of the mainboard;
the second opening exposes the charging end of the mainboard.
18. A wearable device comprising the flexible battery of any of claims 1-11 on one side of the display substrate.
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